I watched it. It looks like the driver didn't even see the gate was down. Possibly like they were distracted by something else and not paying attention.

Watch it again. You can see the crossing gates are down and the car is crossing the tracks in the left hand lane. There's a link on that same site showing a LEO telling what happens. He shows another surveilance video which shows the crossing when it happened. The arms are down and a white truck is stopped. The car doesn't slow down, just gets in the left hand lane and tries to make it across the crossing. The train hits it.

Go to the link above and then click on "Canton Car/Train Collision" for more detail. I had not seen this vantage point before.